Based on the Research Devoted to the Effectiveness of Intergroup

Based on the research devoted to the effectiveness of intergroup contact on producing changes in group attitudes, which of the following statements is correct?

A) There is substantial empirical support demonstrating that intergroup contact is effective in reducing prejudice.
B) Although appealing in theory, research actually shows that contact increases prejudice.
C) Although appealing in theory, there is no empirical support demonstrating that intergroup contact is effective in reducing prejudice.
D) The empirical support demonstrating that intergroup contact is effective in reducing prejudice is inconclusive.